1-(polyhaloalkylthio) indazoles

ABSTRACT

INDAZOLES OF THE FORMULA:   1-((H)(2A+B+1)(X)B(C)A-S-),(Y)N-BENZIMIDAZOLE   WHEREIN A IS 1 OR 2, B IS 3 WHEN A IS 1 AND IS FROM 3 TO 5 WHEN A IS 2, X IS HALOGEN OF ATOMIC NUMBER FROM 17 TO 35 WITH AT LEAST ONE X BEING BONDED TO THE CARBON ATOM WHICH IS BONDED TO THE SULFUR ATOM, Y IS HALOGEN OF ATOMIC NUMBER FROM 17 O 35 OR NITRO IN POSITION 4 TO 6 OF THE INDAZOLE NUCLEUS AND N IS AN INTEGER FROM 0 TO 1. THESE COMPOUNDS ARE FUNGICIDAL AND BACTERICIDAL.

United States Patent Oifice Patented Mar. 7, 1972 US. Cl. 260-310 C ABSTRACT OF THE DISCLOSURE Indazoles of the formula:

wherein a is 1 or 2, b is 3 when a is 1 and is from 3 to when a is 2, X is halogen of atomic number from 17 to 35 with at least one X being bonded to the carbon atom which is bonded to the sulfur atom, Y is halogen of atomic number from 17 to 35 or nitro in positions 4 to 6 of the indazole nucleus and n is an integer from 0 to 1. These compounds are fungicidaland bactericidal.

This invention is directed to l-(polyhaloalkylthio) indazoles and their use as pesticides.

The unique indazoles of this invention are l-polyhaloalkylthio indazoles in which the polyhaloalkylthio group contains 1 to 2 carbon atoms and has 3 to 5 halogens of atomic number of 17 to 35, i.e., chlorine or bromine, at least one of said halogens being bonded to the carbon atom which is bonded to the sulfur and the indazole nucleus has 0 to 1 nitro or halogen substituents in positions 4 to 6 of the indazole nucleus. These compounds may be represented by the general formula n N/N wherein a is 1 or 2, b is 3 when a is 1 and is from 3 to 5 when a is 2, X is halogen of atomic number from 17 to 35 with at least one X being bonded to the carbon atom Which is bonded to the sulfur atom, Y is halogen of atomic number from 17 to 35 or nitro in positions 4 to 6 of the indazole nucleus and n is an integer from 0 to 1. Preferably, X is chlorine, a is 2 and b is 4.

Examples of compounds having the above formula ar l-trichloromethylthio) indazole,

l-(tribromomethylthio indazole,

l-(trichloromethylthio)-4-nitroindazole,

1-(trichloromethylthio)-5-chloroindazole,

1- l',2-dibromo-1',2'-dichloroethylthio) indazole,

l-(perchloroethylthio) indazole,

1-(1,2,2-trichloroethylthio) indazole,

1- 1,l',2',2'-tetrachloroethylthio) indazole,

1-( 1,l',2'-tribromoethylthio) indazole,

1-( 1,1,2,2'-tetrachloroethylthio)-S-nitroindazole,

1-(1,1',2',2-tetrachloroethylthio)-6-bromoindazole, and

1- 1,1',2',2-tetrachloroethylthio)-4-chloroindazole.

These novel indazoles may be made by reacting an appropriate polyhaloalkylsulfenyl halide with indazole. or

a suitably substituted indazole. If desired, the alkali metal salt of indazole may be used. The reaction may becarried out in an aqueous medium or in an organic solvent such as ether, hexaueor benzene. -If an organic solvent is used, a hydrogen halide acceptor, such as a tertiary amine,

must be present. The l-(polyhaloalkylthio) indazolemay be separated from the reaction mixture by conventional methods suchas recrystallization. They are solids which are soluble in organic solvents such as acetone, benzene, ether and the like.

The following examples illustrate specific methods by which the compounds of this invention may be prepared. These examples are ofli'ered as illustrative only and are not meant to limit the invention as described herein. Unless otherwise indicated, percentages are by weight.

EXAMPLE 1 8.1 g. of S-nitroindazole, 10.0 ml. of 1,1,2,2-tetrachloroethylsulfenyl chloride and ml. chloroform were added to 50 ml. water in a flask. 5 ml. of acetone were added to this mixture and it was stirred at room temperature for about 1819 hours. The aqueous layer was then separated from the organic layer and discarded. The organic layer was washed consecutively with dilute aqueous hydrochloric acid and water and then dried over anhydrous magnesium sulfate. The solution was then filtered and stripped under reduced pressure. The solid residue was washed with hexane and then dried to give 16.5 g. of 1 (1',1,2,2' tetrachloroethylthio) 5 nitroindazole. This compound melted at 121-123 C. and had the following analysis: FoundCl, 40.1%, S, 8.55%; calculated- Cl, 39.28%; S, 8.88%.

EXAMPLE 2 Using the general method described in Example 1, 1-(1', 1',2',2-tetrachloroethylthio 6 nitroindazole was prepared using 6-nitroindazole instead of S-nitroindazole. This compound melted at -127 C. and had the following analysis: MoundCl, 38.75%; S, 8.73%; calculated-01, 39.28%; S, 8.88%.

EXAMPLE 3 By the general method described in Example 1, 1-(1', 1,2,2'-tetrachloroethylthio) 5 chloroindazole was prepared using 5-chloroindazole instead of S-nitroindazole. It melted at 9798.5 C. and had the following analysis: FoundCl, 50.70%; S, 9.88%; calculatedCl, 50.88%; S, 9.15%.

EXAMPLE 4 5.0 g. of 5-chloroin'dazole were suspended in 100 ml. chloroform in a flask. 50ml. of water and 7 ml. trichloromethylsulfenyl chloride were added to this suspension. The total mixture was stirred at ambient temperature for 6 /2 hours and then allowed to stand overnight. The chloroform layer was separated from the aqueous layer. The chloroform layer was washed twice with dilute I-ICl, twice with water and then dried over anhydrous magnesium sulfate. After drying the layer was filtered and the chloroform was evaporated off under reduced pressure. A solid formed. It Was washed with mixed hexanes and then dried to give 5.5 g. l-(trichloromethylthio) 5 chloroindazole. It melted at 103-105 C. and had the following analysis: FoundCl, 47.15%; S, 10.62%; calculated-Cl, 46.96%; C, 10.60%.

The indazoles of this invention have excelent biological activity, especially against fungi and bacteria. As a group their activity is in general superior to N-polyhaloalkylthio pyrazoles.

Indazoles of this invention were tested as fungicides by means of the mycelial drop test. This test measures the fungitoxicity of acompound in terms of its inhibition offungus mycelial growth. Each indazole was dissolved in acetone to a 500 p.p.m. concentration. Equal volumes of this solution were applied to the centers of each of three replicate paper discs inoculated with the desired fungus mycelium and placed onpotato-dextrose agar medium. Following this application the discs were incubated "along with inoculated but untreated control discs at ambient temperatures until the control discs were filled with mycelial growth. The fungicidal activity of the indazole was determined by comparing the radii of mycelial growth away from the edges of the treated and control discs. From this comparison a percent inhibition based on the relative mycelial growth areas was determined. The results of these tests are reported in Table I.

4 without departing from the spirit or scope of the disclosure or from the scope of the following claims.

I claim: 1. Indazole of the formula Indazoles of this invention were also tested as bactericides. The test method involved contacting a dilute bacterial suspension with the indazole in an aqueous bacterial medium and was carried out as follows: Bacterial medium was made' by mixing 21.5 g. dehydrated Emersons Broth (beef peptone, glysate, sodium chloride, yeast extract and dextrose) in 900 ml. distilled water. The bacterial suspension was made by preparing 21.5 g. dehydrated Emersons Broth in one 1. distilled water, inoculating the broth with the desired bacteria, incubating the culture and diluting the broth culture tenfold with sterilized water. 9.0 ml. of the medium was put in a 'vial. The vial was capped and autoclaved at 17 psi. for 20 minutes to ensure aseptic conditions. 0.9 ml. of bacterial suspension diluted with water to the same turbidity (measured with a spectrophotometer) as the medium and 50 ml. of an acetone solution of the indazole at the desired concentration were added to the vial.

The :vials contents were then incubated at 2324 C. for 40-48 hours. Photometric readings of the vial were made after this period to determine the turbidity of the vial. Similar readings Were made on an untreated control sample. Percent inhibition of bacterial growth was determined by the following formula Percent inhibition percent light blocked on test percent light blocked on control The test results are reported in Table II.

where a is 1 or 2, b is 3, when a is 1 and is from 3 to 5 when a is 2, X is halogen of atomic number from 17 to 35 with at least one X being bonded to the carbon atom which is bonded to the sulfur atom, Y is halogen of atomic number from 17 to 35 in positions 4 to 6 of the indazole nucleus and n is an integer from 0 to 1.

2. The indazole of claim 1 wherein a is 2 and X is chlorine.

3. The indazole of claim 1 wherein a is 1 and X is chlorine.

4. The indazole of claim 1 wherein d is 2, b is 4, X is chlorine, n is 1 and Y is chlorine in position 5.

5. An indazole of the formula TABLE II Percent inhibition Conccm tration, A C E P Compound ppm.

1-(1 ,1 ,2 ,2-tetraeliloroethylthio) -G- nitro indazole 10 100 100 100 100 3 07 100 100 as 1 s3 s2 17 76 1-(1 ,1 ,2 ,2 -tetrachlorocthyltlno)-5- nitro indazole 10 100 100 100 .1 3 100 100 100 96 1 s3 63 89 85 NOTE.-A=Agr0bactcria tumafacicns: C=Coryncbacieria michiganense; E=Erwinia carotovom; P=Pscudomonas syringae.

Aside from the specific methods shown above, these References Cited indazoles may be applied by conventional methods in UNITED STATES PATENTS fungitoxic and bactericidally effective amounts to fungal and bacterial pathogens or to environments which host 2,553,770 5/1951 Kltfllison these pathogens. They may be applied with appropriate g 5/1921 Hawley et 2 inert carriers and diluents as powders, solutions or disg 19 Kuh e at 16733 2 persions. Pesticidal formulations of these indazoles may 2,888,462 /19 9 cagnon 260-310 5 also contain stabilizers, spreading agents, wetting agents, 7 4/1965 KO n 260 '309' stickers and other compatible pesticides. NATALIE TROUSOF, Primal-y Examiner As will be evident to those skilled in the art, various modifications on this invention can be made or followed, US. Cl. X.R. in the light of the foregoing disclosure and discussion, 424273 

